package com.vs.wms.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginFilter implements Filter {

	private String redirectURL = null;
	
	@Override
	public void destroy() {
		
		System.err.println(">>>>>>>>>>>>>>>>>>>>>>LoginFilter destroy");
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		
		HttpServletRequest servletRequest = (HttpServletRequest) request;
		HttpServletResponse servletResponse = (HttpServletResponse) response;
		
		HttpSession session = servletRequest.getSession();

		if (session.getAttribute("loginUser") != null) {
			
			chain.doFilter(request, response);
		}
		else {
			
			servletResponse.sendRedirect(servletRequest.getContextPath() + redirectURL);
		}
	}

	@Override
	public void init(FilterConfig config) throws ServletException {
		
		System.err.println(">>>>>>>>>>>>>>>>>>>init loginfilter");
		
		this.redirectURL = config.getInitParameter("redirectURL");
	}
}
